MedicalResearch.com: What is the background for this study? What are the main findings?

Response: ​Previous studies have shown that disrupting the community of bacteria in the gut can lead to autism-like behavior in animals. In humans interventions aimed at improving the intestinal microbiome have also led to changes in autism behavior. Here, we examined whether autism-related changes in microbial activity extended to the mouth and throat. We were interested in this site because it provides the initial interface between host immunity and microbe exposure.

By examining nearly 350 children with autism, typical development, or developmental delay (without autism) we identified 12 groups of oral bacteria with unique activity patterns in children with autism. Interestingly, microbial activity (measured by RNA sequencing) also differed between children with autism and gastrointestinal (GI) disturbances and peers with autism but no GI disturbance. Levels of several microbes also displayed correlations with measures of autism behaviors. We utilized microbial activity patterns to create diagnostic panels that displayed accuracy for distinguishing children with autism from peers with typical development (79.5% accuracy) or developmental delay (76.5% accuracy).

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